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udev: keyboard-builtin: Add support for setting IBM trackpoint sensitivity

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IBM / Lenovo trackpoints allow specifying a sensitivity setting through a
ps/2 command, which changes the range of the deltas sent when using the
trackpoint.

On some models with normal usage only deltas of 1 or 2 are send, resulting in
there only being 2 mouse cursor movement speeds, rather than the expected fluid
scale. Changing the sensitivity to a higher level than the bootup default fixes
this.

This commit adds support for setting a POINTINGSTICK_SENSITIVITY value
in hwdb to allow changing the sensitivity on boot through udev / hwdb.
This commit is contained in:
Hans de Goede 2015-04-17 16:48:07 +02:00 committed by Peter Hutterer
parent f29378b443
commit 5defbb5ff6
2 changed files with 40 additions and 0 deletions
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12
hwdb/70-pointingstick.hwdb
View file

@ -41,6 +41,7 @@
#
# Allowed properties are:
# POINTINGSTICK_CONST_ACCEL
# POINTINGSTICK_SENSITIVITY
#
#########################################
# POINTINGSTICK_CONST_ACCEL #
@ -53,6 +54,17 @@
# by how much to multiply deltas generated by the pointingstick to get
# normalized deltas.
#
#########################################
# POINTINGSTICK_SENSITIVITY #
#########################################
#
# TPPS/2 IBM TrackPoint driver sensitivity sysfs setting
# POINTINGSTICK_SENSITIVITY=<sensitivity>
#
# Where <sensitivity> is a number between 0 and 255, note this property
# only applies to TPPS/2 IBM TrackPoint devices, see
# drivers/input/mouse/trackpoint.c in the Linux kernel sources.
#
#
# Sort by by brand, model

28
src/udev/udev-builtin-keyboard.c
View file

@ -146,6 +146,32 @@ static void override_abs(int fd, const char *devnode,
log_error_errno(errno, "Unable to EVIOCSABS device \"%s\"", devnode);
}
static void set_trackpoint_sensitivity(struct udev_device *dev, const char *value)
{
struct udev_device *pdev;
char val_s[DECIMAL_STR_MAX(int)];
int r, val_i;
/* The sensitivity sysfs attr belongs to the serio parent device */
pdev = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
if (!pdev) {
log_warning("Failed to get serio parent for '%s'", udev_device_get_devnode(dev));
return;
}
r = safe_atoi(value, &val_i);
if (r < 0) {
log_error("Unable to parse POINTINGSTICK_SENSITIVITY '%s' for '%s'", value, udev_device_get_devnode(dev));
return;
}
xsprintf(val_s, "%d", val_i);
r = udev_device_set_sysattr_value(pdev, "sensitivity", val_s);
if (r < 0)
log_error_errno(r, "Failed to write 'sensitivity' attribute for '%s': %m", udev_device_get_devnode(pdev));
}
static int open_device(const char *devnode) {
int fd;
@ -223,6 +249,8 @@ static int builtin_keyboard(struct udev_device *dev, int argc, char *argv[], boo
}
override_abs(fd, node, evcode, udev_list_entry_get_value(entry));
} else if (streq(key, "POINTINGSTICK_SENSITIVITY")) {
set_trackpoint_sensitivity(dev, udev_list_entry_get_value(entry));
}
}